[TASK] Avoid MockEventDispatcher

The MockEventDispatcher unit test fixture became
useless with introduction of NoopEventDispatcher.

The patch removes last remains: Most simply inject
NoopEventDispatcher, some others create a mock of
EventDispatcherInterface and use it for event
manipulation when testing $subjects that act on
event results.

Resolves: #104273
Related: #97449
Related: #98016
Releases: main
Change-Id: I0babc60cdd3c87bf9f25a931edfd3f47f642bfae
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85032


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>